From grunts to scoring systems, tennis is a sport that's full of unusual quirks and strange traditions. Read on as we answer ten unusual questions about the history, the rules, and the culture of tennis.

One of my early favourites was "Is the Turin Shroud Genuine After All?" a lovely question in the Mail on Sunday in April 2009, especially for that highly-collectable "After All" at the end, which brilliantly implies that the Mail on Sunday knows perfectly well that the shroud is a fake, but that some startling new evidence has come to light that suggests that the fruitcakes had been right "all along".